Old Friend Solitaire

Old Friend Solitaire uses one deck (52 cards). You have 4 tableau piles with 5 cards per pile.

The object of the game
To discard pairs of cards whose ranks add up to 13.

The rules
Here is a list of valid pairs:

Queen-Ace

Jack-Two

10-3

9-4

8-5

7-6

Kings are discarded singularly. To discard a King simply click on it.
Only the top card of each tableau pile and waste pile is available for play. Spaces may be filled by the top card from the waste pile.

When you have made all the moves initially available, begin turning over cards from the stock to the waste pile.